Regarding the new backends feature, I think its not only expensive, but very inefficient. With the same cost we could rent a decent machine which does unlimited thing and handle thousands of request per second with web server like Tornado. AppEngine backend instance can only handle one request at a time (python/go). You need each request to finish within 1ms to handle more than one thousand request per second. With datastore operation, less than 100ms (i.e. handle 10 requests per second) is already nearly impossible.
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